Optical luminescence dating is a dating technique developed on the basis of thermoluminescence. There are "photosensitive traps" in mineral crystals like Yingshi. When the excited electrons produced by ionizing radiation are captured by them, they become "photosensitive trapped electrons", and they can escape from the "photosensitive trapped electrons" by being excited by light again, and then recombine with the luminescent center to emit light, which is the luminescent signal; The technique of dating using this signal is luminescence method. The age ranges from several hundred years to 654.38+0 million years.